this will be abit hard for noobs.
PHP Code:
USE SRO_VT_ACCOUNT
SELECT reg_ip from TB_USER where STRUSERID ='HIS USERNAMEHERE'
Open Firewall > Inbound Rules > New Rule > CUSTOM > and continue with it untill u find the options to add his IP . now hes completely blocked,for even being able to see site.
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Regards
theres another steps if its not working.since this might be caused of his ip got changed.